Large urban areas - over 1 million and less than 3 million
population.

Medium urban areas - over 500,000 and less than 1 million
population.

Small urban areas - less than 500,000 population.

a Percent changes were
calculated using the numbers in this table and were not obtained from the
source. Ranks are based on the calculated percent changes with the highest
number corresponding to a rank of 1.

NOTES

"Wasted" fuel is the difference between the fuel
consumed under estimated existing conditions and the fuel consumed under
free-flow conditions. Previous editions of this table were calculated on the
basis of total fuel consumed during congested trips. Calculations are made
for peak period speeds and for free-flow speeds on both the freeway and
principal arterial systems. For a more detailed description of the formulas
used, see the source document.

The urban areas included are those containing over 500,000
people and several smaller places mostly chosen by previous sponsors of the
Texas Transportation Institute study on mobility.

Methodology and data sources have been changed in 2009 and were
applied retroactively to past years, these figures are not comparable to
those in the past editions of NTS.

SOURCES

Texas Transportation Institute, Congestion
Data for Your City, Excel spreadsheet of the
base statistics for the 90 urban areas and population group summary
statistics (College Station, TX), available at http://mobility.tamu.edu as of
Jan.19, 2010; and personal communication.